Method for preparing zinc sulfide based phosphor having effective emission at low voltages
AssigneeSamsung SDI Co., Ltd.
InventorsSoo-joung Lee, Jae-eun Jang
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Abstract
A method for preparing a zinc sulfide phosphor having effective emission at low voltages. In the method for synthesizing a green-light emitting zinc sulfide based phosphor, ZnS:Cu, Al, which is applicable to a device operated with a low voltage, novel raw materials are employed. CuI is used as an activator, wherein monovalent copper (Cu1+) is complexed with ammonia and the ammonia complex is incorporated so as to uniformly distribute the activator in the mixture of raw materials. AlF3 is used as a co-activator, and, ZnI2 and NaI are added as iodide series fluxes. Thus, the color display characteristics are improved with a relatively high color purity and luminance.
Claims10
A method for preparing a zinc sulfide based phosphor having effective emission at low voltages, the zinc sulfide based phosphor comprising Cu as an activator, and Al as a co-activator, the method comprising the steps of:
- (a) weighing ZnS, CuI, AlF3 and at least two iodide series fluxes having a high purity, and uniformly mixing the ZnS, Cul, AlF3 and the at least two iodide series fluxes with deionized water to form a paste;
- (b) drying the paste and sieving to form uniform particles, and firing the particles to obtain phosphors;
- and
- (c) sieving and washing the phosphors with deionized water to remove impurities and the fluxes from the phosphors.
A method for preparing a zinc sulfide based phosphor having effective emission at low voltages, the zinc sulfide based phosphor comprising Cu as an activator, Al as a co-activator, the method comprising the steps of:
- (a) uniformly mixing ZnS, CuI, AlF3 and at least two iodide series fluxes with deionized water to form a paste;
- (b) drying the paste and sieving to form uniform particles, and firing the particles to obtain phosphors;
- and
- (c) sieving and washing the phosphors with deionized water to remove impurities and the fluxes from the phosphors.
Dependencies are inferred from the claim text.